Question:
In Gymnosperms like Pinus, the female gametophyte is retained within the:
In Gymnosperms like Pinus, the female gametophyte is retained within the:
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The retention of the female gametophyte within the megasporangium is a crucial evolutionary adaptation that directly led to the development of the seed habit in higher plants.
Updated On: Jun 3, 2026
- Microsporangium
- Pollen grain
- Megasporangium (Ovule)
- Archegonium only
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks about the anatomical location where the female gametophyte is retained and nurtured within gymnospermic plants, such as Pinus.
Step 2: Detailed Explanation:
• Gymnosperms are heterosporous plants, meaning they produce two distinct types of spores: haploid microspores (which develop into male gametophytes) and haploid megaspores (which develop into female gametophytes).
• Inside the megasporangium (which is the central tissue of the ovule, also called the nucellus), a single megaspore mother cell undergoes meiotic division to produce four haploid megaspores.
• Out of these four megaspores, three degenerate, and only one remains functional.
• The functional megaspore undergoes repeated mitotic divisions to form a multicellular haploid structure called the female gametophyte (also known as the endosperm in gymnosperms).
• This female gametophyte develops archegonia (female sex organs) at its micropylar end.
• Unlike lower vascular plants like bryophytes and pteridophytes, gymnosperms do not have free-living male and female gametophytes.
• Instead, the female gametophyte remains completely enclosed and retained within the parent megasporangium (ovule) throughout its development, fertilization, and subsequent seed formation.
• The microsporangium (A) and pollen grain (B) are male reproductive structures, making them incorrect choices.
• The female gametophyte contains the archegonium, but it is itself retained inside the megasporangium, which makes (C) the correct overall structural answer.
Step 3: Final Answer:
In gymnosperms, the female gametophyte is retained within the megasporangium (ovule).
The question asks about the anatomical location where the female gametophyte is retained and nurtured within gymnospermic plants, such as Pinus.
Step 2: Detailed Explanation:
• Gymnosperms are heterosporous plants, meaning they produce two distinct types of spores: haploid microspores (which develop into male gametophytes) and haploid megaspores (which develop into female gametophytes).
• Inside the megasporangium (which is the central tissue of the ovule, also called the nucellus), a single megaspore mother cell undergoes meiotic division to produce four haploid megaspores.
• Out of these four megaspores, three degenerate, and only one remains functional.
• The functional megaspore undergoes repeated mitotic divisions to form a multicellular haploid structure called the female gametophyte (also known as the endosperm in gymnosperms).
• This female gametophyte develops archegonia (female sex organs) at its micropylar end.
• Unlike lower vascular plants like bryophytes and pteridophytes, gymnosperms do not have free-living male and female gametophytes.
• Instead, the female gametophyte remains completely enclosed and retained within the parent megasporangium (ovule) throughout its development, fertilization, and subsequent seed formation.
• The microsporangium (A) and pollen grain (B) are male reproductive structures, making them incorrect choices.
• The female gametophyte contains the archegonium, but it is itself retained inside the megasporangium, which makes (C) the correct overall structural answer.
Step 3: Final Answer:
In gymnosperms, the female gametophyte is retained within the megasporangium (ovule).
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